So if im using a savage long action for the 260, then all id really need to do is switch the bolt face to 308? And also does it make a difference if its a center feed or staggered? I am looking at using aftermarket bottom metal that would fit the AI style mags, but that would be something thats added down the road. As i cant justify having several rifles sitting around at the moment this gun would be used for both hunting and target, so im aiming at keeping the weight around 10lb or so (max 11) scoped.
As to the twist rate i would like to be shooting something around the 140gr weight.
If the choice is to use a Savage action then you can happily use the SA AND it will both feed from the factory mag AND a loaded rds WILL eject out of the action.
Savage SA is actually a mid length action when compared to other makes. The new center feed mag will allow an internal OAL of just under 3" so you can have a 260Rem with 140gr Bergers set at 2.90/2.95" and live happily ever after.
With the Tikka, the Savage SA has the longest '308' mag on the market BUT high cap is a big PITA.
If you go with a bottom metal and an AI style mag, you immediately drop to a 2.8ish" OAL. This is not as big an evil as some think. The gun will still shoot accurately, and you might not even loose any speed - you just need to change your powder choice to suit.
Or shoot 123/130gr class bullets and not worry about it.
Another chambering to add to the confusion is the Hrn 6.5 Creedmore. Again, an answer to a question that really didn't need to be asked but what the hey, it sells stuff.
Enjoy your build - my only tip is price out components, dies BEFORE making your chamber selection. Some new choices have little support in the industry due to 'small' demand.
And what gear is available is much more expensive due to 'small' demand.
They all work, all are superb shooters, all a ton of fun to own and play with.
Pick the bullet weights you want to shoot at whatever speed you feel solves the problem. That will determine the case volume you need to chamber your rig with. Action and mag to suit.
The 6.5 has gone from obscurity in NA to one of the hottest options going. Lots of great answers to the same question.
Jerry